Google Calendar

Google Calendar is a web-based calendar and scheduling service developed by Google, available to users with a Google account. It allows creating and sharing events, setting reminders, and viewing multiple calendars together. It supports importing calendar data in the standard iCalendar (.ics) and vCalendar (.vcs) formats for interoperability with other calendar applications.

Click any badge for full per-format details - what it is, how to open it and how to convert it.